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3D技术在现场血迹重建的应用当前国内对于现场血迹重建的研究重点主要在血迹形态、血迹检测及DNA测定上,由于相关工具的缺乏使对现场血迹的分析应用很难深入和普及。3D技术对现场血迹重建时血迹形态的深入分析提供了很好的工具。目前,3D技术主要应用于现场上因动脉血管破裂,打击、撞击等形成的喷溅状血迹的分析。众所周知,喷溅血迹其形状类似于惊叹号,如果除去其尾部就相当于一个椭圆形。通过实验可知,该椭圆形的形状与血迹投射方向和血迹附着平面的角度(α)有着对应关系,当α为0度时,该椭圆形变为直线;当α为90度时,则为圆形;当α为180度时,则又变为直线。而该椭圆形形状的变化则可以用椭圆形的短轴与长轴之比来表示。根据其变化规律,可推导出其函数关系是α与椭圆的短长轴的比值成正弦函数关系。由此,根据犯罪现场
The application of 3D technology in the field of bloodstain reconstruction At present, the research focus on the field of bloodstain reconstruction mainly focuses on bloodstain morphology, bloodstain detection and DNA determination. Because of the lack of relevant tools, it is very difficult to analyze and spread bloodstains on the spot. 3D technology provides a good tool for in-depth analysis of the bloodstain shape of bloodstain reconstruction on the scene. At present, 3D technology is mainly applied to the analysis of splashing bloodstain formed by arterial rupture, blow, impact and the like in the field. It is well-known that splashed blood is similar in shape to an exclamation point, and is equivalent to an oval if its tail is removed. The experiment shows that the shape of the ellipse is related to the projection direction of the bloodstain and the angle (α) of the blood plasma attachment plane. When α is 0 degree, the ellipse becomes a straight line; when α is 90 degrees, it is circular ; When α is 180 degrees, it becomes a straight line again. The change of the elliptical shape can be expressed by the ratio of the minor axis to the major axis of the ellipse. According to the law of its variation, it can be deduced that the function relationship is a sine function of the ratio of α to the short major axis of the ellipse. Thus, according to the crime scene